New details in midtown murder

New details in a weekend homicide investigation. A Tucson News Now viewer has led police to a key piece of evidence.

Police say 59-year-old George Martinez turned up dead Saturday night in his home near Tucson Boulevard and 22nd Street.

A small memorial sits outside the home where a man was killed. Meanwhile, there are new developments after a Fox 11 viewer spotted the victim's SUV a couple miles away.

The alert viewer noticed the Ford Explorer parked near her home, so she called Tucson Police and they towed it to a tow yard for evidence.

The SUV belonged to Martinez who was killed inside his home this weekend. Police say the Martinez' roommate found him unconscious with signs of trauma. But, it didn't look like anyone had broken in.

We talked to some neighbors Monday afternoon. One man who didn't want to go on camera says Martinez had problems with some tenants about 6 months ago but they had since moved out.

Other neighbors describe Martinez as a quiet man, who kept to himself and loved to work on cars.

"My heart goes out to him. It's a shame," said Paul Johnston, who lives a few doors down. "It's a pretty quiet neighborhood and it's amazing I didn't hear anything."

Sgt. Chris Widmer of the Tucson Police Dept. said, "We don't know if it's anyone known to this victim. Speaking with residents, this guy lived a fairly quiet, normal life. So, we still have a lot of unanswered questions we're trying to fill in."

Police do not know if this was a random act. The killer is still on the run. Anyone with information is asked to call 9-1-1 or 88-crime.